Keith Mitchell was first involved with what is now known as the Internet 20 years ago, as a postgraduate at University College London. Between 1986 and 1991, while working for Edinburgh-based Spider Systems, Keith was a representative on the board of the UK Internet Consortium.

In early 1992, he became one of the founders of the UK's first commercial Internet provider, PIPEX.

From May 1996 until September 2000, Keith served in the full-time role of Executive Chairman of (LINX), the London Internet Exchange. He has served as a non-executive Director of Nominet UK, and as Chairman of the RIPE NCC Executive Board (1997-99).

In September 2000, Keith became a founder investor and served until 2004 as Chief Technical Officer of XchangePoint, a pan-European commercial provider of Internet interconnect and peering services.

Between 2004 and 2006 Keith was Technical Director of the UK Internet Forum, where he setup the UK Network Operators' Forum of which he is now chair.

In 2006 Keith moved to the USA, and has become Programme Manager of the Operations, Analysis and Research Center (OARC).
In 2008 Keith was appointed as Director of Engineering at the Internet Systems Consortium (ISC).